It's three operations. The x operator, is either a string or list multiplier. Here, it's being used on an list, as the item is in parens:
('?') x scalar(@id)
scalar(@id) gives the number of items in the array. So we end up with a list of question marks the same size as the @id array.
The join will flatten a list into a single string, placing the first argument in between each item. So we're placing a comma between each of the question marks.
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